Wind is a form of solar energy. Winds are caused by the uneven heating of the atmosphere by the sun, the irregularities of the earth's surface, and rotation of the earth. Wind flow patterns are modified by the earth's terrain, bodies of water, and vegetative cover.
Next is the lower-middle class, which is primarily comprised of lower-level, white-collar workers. These workers typically have college educations, but lack the graduate degrees needed to advance to higher levels of employment. Income for these workers generally falls between $32,500 and $60,000. Upper-middle-class workers typically have post-graduate degrees and work at high-level, white-collar positions. Household income for these workers is often above $100,000. According to the Census bureau, upper-middle-class, or professional class workers, earn enough to be in the top one-third of American incomes.
By that formulation, the upper middle class might be the fourth-highest income quintileâthe one above the middle but below the wealthiest. Those households range from $74,875 to $121,017 in income, nationally. But of course the relative strength of your income depends largely on where you live. In New England, the Census Bureau says, median income jumps to $70,077. In the central southeast states, it falls to $47,356. That means an upper-middle-class salary in the Tennessee might barely qualify for middle class in Massachusetts.